Using engine routes

Routing specs can specify the routeset that will be used for the example group. This is most useful when testing Rails engines.

Specify engine routes

Given a file named "spec/routing/engine_routes_spec.rb" with:

require "rails_helper"

# A very simple Rails engine
module MyEngine
  class Engine < ::Rails::Engine
    isolate_namespace MyEngine
  end

  Engine.routes.draw do
    resources :widgets, :only => [:index]
  end

  class WidgetsController < ::ActionController::Base
    def index
    end
  end
end

RSpec.describe MyEngine::WidgetsController, type: :routing do
  routes { MyEngine::Engine.routes }

  it "routes to the list of all widgets" do
    expect(:get => widgets_path).
      to route_to(:controller => "my_engine/widgets", :action => "index")
  end
end

When I run rspec spec

Then the examples should all pass.